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Up until this week I was able to dim my laptop to a very dim setting, barely any brightness at all, which I liked at night. After upgrading to 15.04, the maximum dim is way brighter than it was before. I lost my ultra-dim capabilities. What happened, and how can I get my ultra-dim options back?

ian-campbell
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1 Answers1

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Try editing this file:

sudo nano /sys/class/backlight/acpi_video0/brightness

May be elsewhere under /sys/class/backlight/*/brightness

source: Set brightness lower

EDIT:

Try reducing the gamma with redshift:

Reducing Contrast

Community
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Trey Gordon
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  • That file seems to be empty. – ian-campbell Jun 03 '15 at 05:53
  • post ls /sys/class/backlight – Trey Gordon Jun 03 '15 at 05:57
  • I found what you're talking about. /sys/class/backlight/intel_backlight/brightness. I set the level to "1" to get it as dark as it will go, but it's not very dark at all. I tried 0.1, but got this error: Unable to save /sys/class/backlight/intel_backlight/brightness Error: administrator_copy_file(/tmp/.subl1f9.tmp, /sys/class/backlight/intel_backlight/brightness) failed: Authorization failed. I guess it can't be set below 1, but somehow I need it to be. – ian-campbell Jun 03 '15 at 06:54
  • Good answer. Installed redshift and now if i go redshift -b 0.1 it makes the screen ridiculously dim. Thanks. – ian-campbell Jun 04 '15 at 01:31